I am planning to install a network in my house but am confused about whether I should choose the keystone coupler or the ethernet keystone jack. What are the differences between them?
The difference is that both ends of the keystone coupler need to be inserted into the installed RJ45 plug. Ethernet keystone jack one end of the module, you need to terminate the cable to the module, and the other end needs to be inserted into the installed RJ45 plug.
If you use patch cables instead of RJ45 cables, it is recommended to use the keystone coupler. You can choose the ethernet keystone jack if you use your wiring to terminate the RJ45 cables. Using an ethernet keystone jack can eliminate the need to install the RJ45 plug at one end of the cable.
are you novice?
Here are the difference:
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Function: Ethernet keystone coupler can connect two ethernet cables together. On the other hand, the keystone jack is used to terminate the ethernet wires.
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Appearance: Ethernet keystone coupler is small and portable. They are suitable for temporary settings or situations that need to be connected or disconnected. However, the design of keystone Jack is used for permanent device. They can all be installed in the wall plate or patch panel.
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Installation: Ethernet keystone coupler is relatively simple to install because it does not need other tools. You only need to insert the two ethernet cables into it. However, the keystone jack needs some other steps to install. They need to use the puch down tool to terminate the termination of the ethernet wires correctly.
After knowing the above information, I believe you have your own choice. 
A keystone coupler is used to extend the length of a network cable by connecting two cables together. On the other hand, an ethernet keystone jack requires installation and setup before it can be used. If you want more details, you can check out some videos on YouTube. It might make things clearer for you.